Abstract
Computed Tomography (CT) has been one of the most used exam for radiologic diagnostic in medicine. The increase of CT is a global concern due to high doses of radiation. The dose evaluation in CT is one of many steps that can contribute for reducing patient doses. The head CT scans helps to diagnose disorders that affect the brain, including tumors, infarction, bleeding within the brain, hematoma and other diseases. The aim of this work is to compare the reduction of absorbed dose in the head CT scan with and without the use of bismuth shielding using a male and female anthropomorphic phantom model Alderson Rando.The head CT scan were done from the cervical vertebra C1 to the top of skull, in a GE CT scanner, LightSpeed VCT model, with 64 channels.Radiochromic films strips were used to evaluate the doses in the organs such as lenses, thyroid, hypophysis, spinal cord, pharynx, breasts, salivary and parotid glands.Record doses were lower with the use of bismuth shielding in both phantoms for all organs, mainly in the lenses. The analysis of noise in the image of the head central slice presented acceptable values for soft tissues, less than 1%. Dose values were significantly reduced and they suggested that the use of bismuth shielding would be a proper procedure for protection during a head CT scan.
Highlights
Computed Tomography (CT) has been one of the most used exam for radiologic diagnostic in medicine
The lens is one of the organs located in the skull with relative high radiosensitivity, organ that is under consideration in this work of dosimetry, using elements such a radiochromic films and bismuth eye protector before the CT scan [4]
The aim of this work is to compare the reduction of absorbed dose in the head CT scan with and without the use of bismuth shielding using a male and female anthropomorphic phantom Alderson Rando model
Summary
Computed Tomography (CT) has been one of the most used exam for radiologic diagnostic in medicine. The increase of CT is a global concern due to high doses of radiation [1]. The absorbed dose in organs with higher radiation sensitivity levels are object of continuous discussions, because of the risks that this can bring to health tissues [3]. The lens is one of the organs located in the skull with relative high radiosensitivity, organ that is under consideration in this work of dosimetry, using elements such a radiochromic films and bismuth eye protector before the CT scan [4]. The aim of this work is to compare the reduction of absorbed dose in the head CT scan with and without the use of bismuth shielding using a male and female anthropomorphic phantom Alderson Rando model
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